The obvious thing to do in an undertaking like "The Greatest Heavy Metal Bands of All Time" is to get top 10s from some prominent metal musicians. Well, we decided to do the unobvious and get them from some prominent metalheads who are not musicians — some wrestlers, a baseball player, a magician and the dudes who directed the excellent new documentary, "Metal: A Headbanger's Journey." Don't worry, we threw in some musicians just to mix things up...